Oracle Error Message
ORA-30554: function-based index string.string is disabled
Reason for the Error
An attempt was made to access a function-based index that has been marked disabled because the function on which the index depends has been changed.
Solution
Perform one of the following actions: — drop the specified index using the DROP INDEX command — rebuild the specified index using the ALTER INDEX REBUILD command — enable the specified index using the ALTER INDEX ENABLE command — make the specified index usable using the ALTER INDEX UNUSABLE command